getVectorSetListFeatures: Get positional features of a list of openSkiesStateVectorSet...
In openSkies: Retrieval, Analysis and Visualization of Air Traffic Data

Description Usage Arguments Value Examples

View source: R/openSkies_clusteringFunctions.R

Retrieves positional features of a list of openSkiesStateVectorSet objects. Features will be uniformly interpolated from the observed values for all the openSkiesStateVectorSet objects.

1 2	getVectorSetListFeatures(stateVectorSetList, resamplingSize=15, method="fmm", scale=TRUE, fields=NULL)

`stateVectorSetList`	list of objects of class `openSkiesStateVectorSet` for which positional features should be extracted.
`resamplingSize`	number of uniformly separated interpolation points at which the values of the position features should be calculated.
`method`	method to be used for interpolation. "linear" will result in linear interpolation, while "fmm", "periodic", or "natural" will result in different types of spline interpolation.
`scale`	logical indicating if the matrix of features should be scaled by applying the `scale` function. This can be desirable if the features are going to be used for clustering.
`fields`	character vector indicating the names of the fields of the `openSkiesStateVector` objects that should be included in the extracted positional features. In the default behavior, `fields=NULL` and only latitude and longitude values will be used.

A matrix with positional features of the provided list of openSkiesStateVectorSet objects. Each row of the matrix represents a vector of features for each of the openSkiesStateVectorSet objects. Each vector alternates values of longitude and latitude at each interpolated point, unless a character vector with valid names of fields of openSkiesStateVector objects is provided through fields, in which case values of the specified fields are alternated, in the specified order.

# Extract positional features for a time series of state vectors for the 
# aircraft with ICAO 24-bit address 403003 for the 8th of October, 2020 between 
# 16:50 and 16:53 (London time), with a time resolution of 1 minute.

if(interactive()){
vectors1=getAircraftStateVectorsSeries(aircraft="345107", 
startTime="2020-11-04 11:55:00", endTime="2020-11-04 13:10:00", 
timeZone="Europe/London", timeResolution=300)

vectors2=getAircraftStateVectorsSeries(aircraft = "4ca7b3", 
startTime="2020-11-04 10:30:00", endTime="2020-11-04 12:00:00",
timeZone="Europe/London", timeResolution=300)

vectors_list=list(vectors1, vectors2)

features_matrix=getVectorSetListFeatures(vectors_list, scale=FALSE, 
                                         fields=c("longitude", "latitude", "true_track"))
}